The Figure Below Shows the Structures Involved in Attachment of HIV

The figure below shows the structures involved in attachment of HIV to a host cell. The protein gp120 is represented by the number ________; CCR5 is indicated by ________ and CD4 by ________.

A) 1; 2; 3
B) 2; 3; 4
C) 3; 1; 2
D) 4; 1; 2
E) 5; 3; 4